'\" te
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.TH USB_CFG_DESCR 9S "Jan 5, 2004"
.SH NAME
usb_cfg_descr \- USB configuration descriptor
.SH SYNOPSIS
.nf
#include <sys/usb/usba.h>
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI)
.SH DESCRIPTION
The \fBusb_cfg_descr_t\fR configuration descriptor defines attributes of a
configuration. A configuration contains one or more interfaces. A configuration
descriptor acts as a header for the group of other descriptors describing the
subcomponents (for example, interfaces and endpoints) of a configuration.
Please refer to Section \fI9.6.3\fR of the \fIUSB 2.0\fR specification. The
\fIUSB 2.0\fR specification is available at \fIwww.usb.org\fR.
.sp
.LP
One or more configuration descriptors are retrieved from a USB device during
device enumeration. They can be accessed via \fBusb_get_dev_data\fR(9F).
.sp
.LP
A configuration descriptor has the following fields:
.sp
.in +2
.nf
uint8_t         bLength                 Size of this descriptor
                                        in bytes.

uint8_t         bDescriptorType         Set to USB_DESCR_TYPE_CFG.

uint16_t        wTotalLength            Total length of data returned
                                        including this and all other
                                        descriptors in this configuration.

uint8_t         bNumInterfaces          Number of interfaces in this
                                        configuration.

uint8_t         bConfigurationValue     ID of this configuration
                                        (1-based).

uint8_t         iConfiguration          Index of optional configuration
                                        string. Valid if > 0.

uint8_t         bmAttributes            Configuration characteristics
                                        (See below).

uint8_t         bMaxPower               Maximum power consumption, in
                                        2mA units.

Configuration descriptors define the following bmAttributes:
     USB_CFG_ATTR_SELFPWR       -      Set if config not using bus power.
     USB_CFG_ATTR_REMOTE_WAKEUP -      Set if config supports rem wakeup.
.fi
.in -2

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	PCI-based systems
_
Interface stability	Committed
.TE

.SH SEE ALSO
.BR attributes (7),
.BR usb_get_alt_if (9F),
.BR usb_get_cfg (9F),
.BR usb_get_dev_data (9F),
.BR usb_get_string_descr (9F),
.BR usb_parse_data (9F),
.BR usb_ctrl_request (9S),
.BR usb_dev_descr (9S),
.BR usb_dev_qlf_descr (9S),
.BR usb_ep_descr (9S),
.BR usb_if_descr (9S),
.BR usb_other_speed_cfg_descr (9S),
.BR usb_string_descr (9S)
